Fix uninitialised pointer warning
Fix uninitialised pointer warning

ged-lab/khmer,Winterflower/khmer,ged-lab/khmer,F1000Research/khmer,ged-lab/khmer,souravsingh/khmer,Winterflower/khmer,Winterflower/khmer,F1000Research/khmer,souravsingh/khmer,F1000Research/khmer,souravsingh/khmer